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problem in XOR of private key using public key....

hi,
In my application , i am generating public key and private key using RSA algo and using 1024 bytes.
and i am storing that keys in file.
that is completed fine..

now, my requirement is that i have to store private key in some secure way.

so, now have encrypt that private key.so, i have to XOR private key using public key..
i.e. privatekey ^ publickey
and after that i have to store public key and encrypted private key in file..

so, when i encrypt file, i am using public key.
and for decryption i use that private key..
but before using private key, i have to XOR that using public key.
so, i again get orignal priavate key....

so, who i can do this ?
i try hard but there is problem that i get bytes from private key it is ok, but how i can get again private key from bytes.
and size of both public key and private key byte is not same, so problem in XOR process.